On Tue, 14 Mar 2000, Scott M. Ransom wrote:
> Hello,
>
> I have just set up RAID0 with two 30G DiamondMax (Maxtor) ATA-66 drives
> connected to a Promise Ultra66 controller.
>
> I am using raid 0.90 in kernel 2.3.51 on a dual PII-450 with 256M RAM.
>
> Here are the results from bonnie:
>
> -------Sequential Output-------- ---Sequential Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
> MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
> 1200 6813 98.2 41157 42.0 10101 25.9 5205 78.9 14890 27.3 137.8 1.8
>
> Seems like my sequential block writes are 3 times faster than the
> reads. Any idea why that would be?
Someone (Probably Andre Hedrick, or perhaps Andrea Arcangali -- sorry guys, I
don't recall) explained this on LKML. Out of my memory it has something to do
with ATA modes and the kernel configuration. You haven't enabled ``Generic
busmaster support'', or perhaps one of the other IDE driver options, I don't
exactly remember which. But I was going to try it out myself as I see the same
odd numbers on a test system.
If you experiment a little and find the right option, please post here :)
Or search the LKML archives, the mail was posted last week (I think).
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